Turbo z32. What AFR would be considered "normal", and what would be rich and lean looking for the number AFR 12:1 or whatever they are meant to be aware that its not set in stone just looking for a indication of where it should be......
idle and cruis 14.5 to 15 wide open 11.5 to 12.8 closed throttle decel could go 25 + these are ball parks
Lean is HIGHER...... An AFR of 15 is leaner than an AFR of 12 An AFR of 10 is rich as buggery (almost throwing fuel out the exhaust)
zx299 is correct. 15 is lean. 10 is rich. You want to target around 11.5-12 at WOT full boost. Bear in mind we're talking AFR's which are fuel specific, the above is for standard fuel, not ethanol blended fuel. These days it's better to talk in lambda. Lambda is the same regardless of fuel. Google is your friend
We are talking air : fuel ratio. Exactly that. Ratio of air per part of fuel. Stoich for petrol is 14.7 : 1. Richer means less air per part fuel ie 10 : 1. Leaner is more air per part fuel ie 17 : 1. Lambada reading of 1 is stoich for whichever fuel is used.
I think max power is around 12.5 but for turbos they seem to like you to stick under 12 at WOT. I think a stock NA can run at 12.5 at WOT (I know someone running their NA at 13 at WOT).